Brandi Warner
Biomechanics
9-4-12
Introduction
For this project I have chosen to analyze the movement one does to hit a tennis ball. I plan to
become a physical therapist so I found something that relates the two. Hitting a tennis ball is helpful for
ther

Muscle
Erector spinae group
Origin
Common tendon that
attaches to the
posterior surface of
sacrum, iliac crest,
spinous processes of
the lumbar and last two
thoracic vertebrae.
Iliac fossa
Insertion
Various attachments of
the pposterior surface
of sacrum,